Interesting, this is how I actually make progres building my own lang in the side (https://tablam.org https://tablam.org). I discover "early" that parsing will

Interesting, this is how I actually make progres building my own lang in the side (https://tablam.org https://tablam.org). I discover "early" that parsing will be at mercy of each change in direction on the internals, making a costing rewrite each time. Is like premature, aimless, unit-testing, where the cost of testing dominate the actual code to write. So, eventually I split my efforts in 2: On the side I just write programs in the imaginary syntax and change it even in each line. But the whole action was from AST->Execution. I don't bother to parsing until very late in the game, and I think I could have deferred even more. This is not because I believe the syntax "don't matter", I think the opposite!, but you can't know which syntax its the best until you nail the semantics. If the parsing/syntax is introduced too early you could going backwards to support THAT syntax bolted on the semantics, instead of left the semantics guide you. ie: Is like UX/UI: If the program is not well defined, the UI will distort it.